I had a problem with my new 127 refillable carts. and was in Mexico. I contacted Peter at CIS via email and he called on the phone, to Mexico, and walked me thru the problem but we couldn't correct it. When I finally got back to the states they replaced the 4 chips via 1st class mail. About 2 months another problem and Peter spent about a 1/2 hr with me on the phone and we got the problem fixed. CIS service and their putting me the customer number one is almost impossible to find today. I can not speak highly enough of them.